1. Department of Obstetrics and Gynecology, Jichi Medical University School of Medicine
2. Department of Gynecology and Obstetrics, Kyoto University
3. Department of Obstetrics and Gynecology, Kasukabe Medical Center
4. Department of Obstetrics and Gynecology, Saitama Medical Center, Saitama Medical University
5. Department of Obstetrics and Gynecology, University of Toyama
6. Department of Obstetrics and Gynecology, Juntendo University
7. Department of Medical, Quality and Regulatory, Roche Diagnostics K. K.